package string;

import java.util.Locale;

public class ToUpperCaseDemo {
    public static void main(String[] args) {
        String a="我爱Java";
        String b=a.toUpperCase();
        System.out.println(b);
        String c="我LOVE上班";
        String d=c.toLowerCase();
        System.out.println(d);
    }
}
